I enjoyed both chapters of this game. It's a really well done fan game. Playing a lot of mystery vns you start to recognize patterns long before the reveal so I was happy that I was genuinely not aware who the killer was until how they actually did it started getting discussed. 

It's really well executed writing to keep you guessing but never felt illogical or utilizing off-screen actions  some games rely on to preserve their twists, so great job! 

I just have some small nitpicks. I'm going to keep it spoiler free just as a precaution.

Firstly:  When the final piece of evidence is discussed it's mentioned the killer had no chance to get rid of it other than a small window of time, but because certain locations are blocked it's not possible they had the opportunity. The problem for me is there is a hallway of rooms easily accessible and it's not mentioned why the killer couldn't use those. I think the implication is that people were in the hallway but if that's the case the game doesn't mention it.

Secondly: It seems pretty clear given the body's location that the victim was a few steps from safety and unrestrained. if they were in that aggressive mindstate why wouldn't they chase or at least approach? So ultimately the killer's plan was reliant on a lot of luck and that seems out of character for how calculated the murder was.

Lastly: Tozu mentions voting but the characters are never shown to vote, not even verbally, he just announces they're correct.